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    (1) The research is so designed that once nothing can be done to change it. A. begins B. having begun C. beginning D. begun (2) in the queue for almost half an hour, he suddenly realized that he forgot his code. A. Having waited B. Waited C. To wait D. Waiting 【查看更多】

     

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    The research is so designed that once _______ nothing can be done to change it.

    A. begins B. having begun

    C. beginning   D. begun

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    The research is so designed that once ____ nothing can be done to change it.  

    A. begins B. having begun C. beginning D. begun

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    The research is so designed that once _______ nothing can be done to change it.

    A. begins B. having begun  C. beginning  D. begun

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    The research is so designed that once _______ nothing can be done to change it.

    A. begins           B. having begun     C. beginning     D. begun

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    The research is so designed that once _______ nothing can be done to change it.

    A. begins B. having begun

    C. beginning   D. begun

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